US8169905B2 - Packet communication method and receiving-side apparatus - Google Patents

Packet communication method and receiving-side apparatus Download PDF

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US8169905B2
US8169905B2 US12/594,897 US59489708A US8169905B2 US 8169905 B2 US8169905 B2 US 8169905B2 US 59489708 A US59489708 A US 59489708A US 8169905 B2 US8169905 B2 US 8169905B2
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receiving
packet
side apparatus
rlc
reordering timer
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US20100118780A1 (en
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Anil Umesh
Minami Ishii
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NTT Docomo Inc
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NTT Docomo Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1848—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H04L1/1841—Resequencing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/03—Protocol definition or specification 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/324—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the data link layer [OSI layer 2], e.g. HDLC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets

Definitions

  • the present invention relates to a packet communication method in which a sublayer of a transmitting-side apparatus transmits a packet with a given sequence number to a sublayer of a receiving-side apparatus, and also to the receiving-side apparatus.
  • LTE Long Term Evolution
  • RAN radio access network
  • the radio access network (E-UTRAN: Evolved Universal Terrestrial RAN) in an LTE mobile communication system is configured of a mobile station UE (User Equipment) and a radio base station eNB (E-UTRAN Node B).
  • This system is configured in such a way that the mobile station UE and the radio base station eNB communicate with each other via a radio link (RL).
  • RL radio link
  • each of the mobile station UE and the radio base station eNB is configured to terminate an RLC (Radio Link Control) sublayer, a MAC (Medium Access Control) sublayer and a physical (PHY: Physical) layer.
  • RLC Radio Link Control
  • MAC Medium Access Control
  • PHY Physical
  • a transmitting-side apparatus (mobile station UE or radio base station eNB) is configured to perform RLC processing, MAC processing and PHY processing sequentially for data to be transmitted and then to transmit the data as radio signals from a radio unit.
  • a receiving-side apparatus (mobile station UE or radio base station eNB) is configured to extract the transmitted data by performing PHY processing, MAC processing and RLC processing sequentially for the radio signals received by a radio unit.
  • the data to be transmitted includes user data (U-plane data) generated by an application or the like used by the user, and control data (C-plane data) used in controlling the mobile communication system, such as RRC (Radio Resource Control) signaling and NAS (Non Access Stratum) signaling.
  • U-plane data user data
  • C-plane data control data used in controlling the mobile communication system, such as RRC (Radio Resource Control) signaling and NAS (Non Access Stratum) signaling.
  • RRC Radio Resource Control
  • NAS Non Access Stratum
  • this system is configured in such a way that RLC retransmission control processing is performed between the RLC sublayer of the transmitting-side apparatus and the RLC sublayer of the receiving-side apparatus, and that HARQ (Hybrid Automatic Repeat Request) retransmission control processing (MAC retransmission control processing) is performed between the MAC sublayer of the transmitting-side apparatus and the MAC sublayer of the receiving-side apparatus.
  • HARQ Hybrid Automatic Repeat Request
  • a receiving-side apparatus is configured so that the MAC sublayer performs reordering processing for received RLC-PDUs (actually, MAC-PDUs to which the RLC-PDUs are mapped), and then transmits the RLC-PDUs to the RLC sublayer in the order of the sequence numbers, as shown in FIG. 1 .
  • the RLC sublayer is configured to unconditionally determine that a packet loss has occurred, when receiving an RLC-data-PDU of a sequence number # 4 before receiving an RLC-data-PDU (AMD-PDU in an IMT-2000 mobile communication system) of a sequence number # 3 , and to transmit a STATUS-PDU (NACK) that requests retransmission of the RLC-data-PDU of the sequence number # 3 , as shown in FIG. 2 .
  • NACK STATUS-PDU
  • a MAC sublayer is configured to transmit an RLC-PDU to an RLC sublayer without performing reordering processing for received RLC-PDUs in a receiving-side apparatus.
  • An object of the present invention is to provide a packet communication method and a receiving-side apparatus that enable an RLC sublayer to appropriately detect an occurrence of a packet loss in a case where a MAC sublayer does not perform reordering processing for received RLC-PDUs.
  • a first aspect of the present invention is summarized as a packet communication method in which a predetermined sublayer of a transmitting-side apparatus transmits a packet with a given sequence number to a predetermined sublayer of a receiving-side apparatus, the method including the steps of: starting, at the predetermined sublayer of the receiving-side apparatus, a reordering timer, when receiving a second packet before receiving a first packet in a case where a sequence number of the first packet is smaller than a sequence number of the second packet; and transmitting, at the predetermined sublayer of the receiving-side apparatus, a retransmission request for the first packet, when not receiving the first packet until the reordering timer expires.
  • the predetermined sublayer of the receiving-side apparatus can start the reordering timer, when receiving the second packet before receiving a plurality of the first packets; and the predetermined sublayer of the receiving-side apparatus can transmit a retransmission request for the unreceived first packet, when not receiving all of the plurality of the first packets until the reordering timer expires.
  • the first and second packets can be transmitted via a logical channel established between the predetermined sublayer of the transmitting-side apparatus and the predetermined sublayer of the receiving-side apparatus; and the reordering timer can be set for each of the logic channels.
  • the receiving-side apparatus can be notified of a setting value of the reordering timer by an RRC (Radio Resource Control) message.
  • RRC Radio Resource Control
  • a second aspect of the present invention is summarized as a packet communication method in which a predetermined sublayer of a transmitting-side apparatus transmits a packet with a given sequence number to a predetermined sublayer of a receiving-side apparatus, the method including the steps of: starting, at the predetermined sublayer of the receiving-side apparatus, a reordering timer, when receiving a second packet before receiving a first packet in a case where a sequence number of the first packet is smaller than a sequence number of the second packet; and determining, at the predetermined sublayer of the receiving-side apparatus, that there is no chance to receive the first packet, when not receiving the first packet until the reordering timer expires; wherein the first and second packets are transmitted via a logical channel established between the predetermined sublayer of the transmitting-side apparatus and the predetermined sublayer of the receiving-side apparatus; and the reordering timer is set for each of the logic channels.
  • the predetermined sublayer of the receiving-side apparatus can start the reordering timer, when receiving the second packet before receiving a plurality of the first packets; and the predetermined sublayer of the receiving-side apparatus can determine that there is no chance to receive the unreceived first packet, when not receiving all of the plurality of the first packets until the reordering timer expires.
  • the predetermined sublayer of the receiving-side apparatus can manage a receive window that defines an upper limit value and a lower limit value of a sequence number of a receivable packet; and the predetermined sublayer of the receiving-side apparatus can set the lower limit value of the receive window to a value larger than the sequence number of the first packet, when determining that there is no chance to receive the first packet.
  • the receiving-side apparatus can be notified of a setting value of the reordering timer by an RRC (Radio Resource Control) message.
  • RRC Radio Resource Control
  • a third aspect of the present invention is summarized as a receiving-side apparatus configured to receive a packet with a given sequence number from a predetermined sublayer of a transmitting-side apparatus, wherein the predetermined sublayer of the receiving-side apparatus is configured to start a reordering timer, when receiving a second packet before receiving a first packet in a case where a sequence number of the first packet is smaller than a sequence number of the second packet; and the predetermined sublayer of the receiving-side apparatus is configured to transmit a retransmission request for the first packet, when not receiving the first packet until the reordering timer expires.
  • the predetermined sublayer of the receiving-side apparatus can be configured to start the reordering timer, when receiving the second packet before receiving a plurality of the first packets, and the predetermined sublayer of the receiving-side apparatus can be configured to transmit a retransmission request for the unreceived first packet, when not receiving all of the plurality of the first packets until the reordering timer expires,
  • the first and second packets can be configured to be transmitted via a logical channel established with the predetermined sublayer of the transmitting-side apparatus, and the reordering timer can be configured to be set for each of the logic channels.
  • a setting value of the reordering timer can be notified by an RRC (Radio Resource Control) message.
  • RRC Radio Resource Control
  • a fourth aspect of the present invention is summarized as a receiving-side apparatus configured to receive a packet with a given sequence number from a predetermined sublayer of a transmitting-side apparatus, wherein the predetermined sublayer of the receiving-side apparatus is configured to start a reordering timer, when receiving a second packet before receiving a first packet in a case where a sequence number of the first packet is smaller than a sequence number of the second packet; the predetermined sublayer of the receiving-side apparatus is configured to determine that there is no chance to receive the first packet when not receiving the first packet until the reordering timer expires; the first and second packets are configured to be transmitted via a logical channel established with the predetermined sublayer of the transmitting-side apparatus; and the reordering timer is configured to be set for each of the logic channels.
  • the predetermined sublayer of the receiving-side apparatus can be configured to start the reordering timer, when receiving the second packet before receiving a plurality of the first packets; and the predetermined sublayer of the receiving-side apparatus can be configured to determine that there is no chance to receive the unreceived first packet, when not receiving all of the plurality of the first packets until the reordering timer expires.
  • the predetermined sublayer of the receiving-side apparatus can be configured to manage a receive window that defines an upper limit value and a lower limit value of a sequence number of a receivable packet; and the predetermined sublayer of the receiving-side apparatus can be configured to set the lower limit value of the receive window to a value larger than the sequence number of the first packet, when determining that there is no chance to receive the first packet.
  • a setting value of the reordering timer can be notified by an RRC (Radio Resource Control) message.
  • RRC Radio Resource Control
  • the present invention it is possible to provide a packet communication method and a receiving-side apparatus that enable an RLC sublayer to appropriately detect an occurrence of a packet loss in a case where a MAC sublayer does not perform reordering processing for received RLC-PDUs.
  • FIG. 1 is a diagram for describing an operation in a receiving-side apparatus of a conventional mobile communication system.
  • FIG. 2 is a diagram for describing an operation in the receiving-side apparatus of the conventional mobile communication system.
  • FIG. 3 is a diagram for describing an operation in the receiving-side apparatus of the conventional mobile communication system.
  • FIG. 4 is a diagram showing a protocol layer configuration in a radio access network of a mobile communication system according to a first embodiment of the present invention.
  • FIG. 5 is a functional block diagram of an RLC sublayer in a mobile station and a radio base station according to the first embodiment of the present invention.
  • FIG. 6 is a diagram for describing re-segmentation processing to be performed in the RLC sublayer in a mobile station and a radio base station according to the first embodiment of the present invention.
  • FIG. 7 is a diagram showing an example of a format of a STATUS-PDU to be generated by an RLC sublayer in a mobile station and a radio base station according to the first embodiment of the present invention.
  • FIG. 8 is a diagram for describing an operation of an RLC sublayer in a mobile station and a radio base station according to the first embodiment of the present invention.
  • FIG. 9 is a sequence diagram showing operations of the mobile communication system according to the first embodiment of the present invention.
  • FIG. 10 is a diagram showing an operation of an RLC sublayer in a mobile station and a radio base station according to the first embodiment of the present invention.
  • FIG. 11 is a flowchart showing operations of an RLC sublayer in a mobile station and a radio base station according to a modification example 1 of the present invention.
  • the description will be given of a mobile communication system including an LTE/SAE (System Architecture Evolution) architecture for which standardization by 3GPP has been in progress, as an example, as shown in FIG. 4 , but the present invention is not limited to the mobile communication system, and is applicable to a mobile communication system including another architecture.
  • LTE/SAE System Architecture Evolution
  • RLC sublayer of Acknowledge mode (AM) (hereinafter, referred to as RLC sublayer) with reference to FIG. 5 .
  • a part of or all of the functions (modules) constituting the RLC sublayer shown in FIG. 5 may be implemented by hardware or software on an IC chip.
  • functions (modules) constituting a MAC sublayer and a physical layer for which simple and high speed processing is generally required may be configured to be implemented by hardware
  • functions (modules) constituting the RLC sublayer for which complex processing is generally required may be configured to be implemented by software.
  • a function (module) constituting the physical layer a function (module) constituting the MAC sublayer and a function (module) constituting the RLC sublayer may be implemented on the same IC chip, or may be implemented on different IC chips, respectively.
  • the RLC sublayer includes an RLC-SDU buffer 11 , a new transmission buffer 12 , a segmentation-concatenation processor unit 13 , an ACK waiting buffer 14 , a retransmission buffer 15 , an RLC-PDU transmitter unit 16 , a re-segmentation processor unit 17 , an RLC-PDU transmitter unit 18 , an RLC-control-PDU generation unit 19 , an RLC-control-PDU buffer 20 , a de-multiplex unit 31 , a reordering buffer 32 , a reassembly buffer 33 and an RLC-SDU reassembly unit 34 .
  • the RLC-SDU buffer 11 is configured to store an RLC-SDU received from an upper layer therein.
  • the new transmission buffer 12 is configured to copy the RLC-SDU stored in the RLC-SDU buffer 11 , and then to store the RLC-SDU therein.
  • the segmentation-concatenation processor unit 13 is configured to perform segmentation processing or concatenation processing for the RLC-SDU (or a part thereof) stored in the new transmission buffer 12 , and thereby to generate an RLC-data-PDU whose size becomes the largest within a range of an allowable amount of transmission data notified from a MAC sublayer along with a notification, in a case where a data transmission event is notified by the MAC sublayer.
  • segmentation-concatenation processor unit 13 is configured to transmit the generated RLC-data-PDU to the RLC-PDU transmitter unit 16 , and also to cause the generated RLC-data-PDU to be stored in the ACK waiting buffer 14 .
  • the ACK waiting buffer 14 is configured to store, therein, the RLC-data-PDU from the segmentation-concatenation processor unit 13 , an RLC-data-PDU or an RLC-data-Sub-PDU from the retransmission buffer 15 , and an RLC-data-Sub-PDU from the re-segmentation processor unit 17 .
  • the ACK waiting buffer 14 is configured to determine whether or not retransmission for the stored RLC-data-PDU or RLC-data-Sub-PDU is necessary, and to transmit, to the retransmission buffer 15 , the RLC-data-PDU or RLC-data-Sub-PDU for which a determination is made that retransmission thereof is necessary.
  • the ACK waiting buffer 14 determines whether or not it is necessary for the stored RLC-data-PDU or RLC-data-Sub-PDU to be retransmitted, in a case where a STATUS-PDU (NACK) from the RLC sublayer and in a case where a NACK from the MAC sublayer of the receiving-side apparatus are received.
  • NACK STATUS-PDU
  • FIG. 7 a format example of a STATUS-PDU (NACK) used in the mobile communication system according to the present embodiment is shown.
  • NACK STATUS-PDU
  • the STATUS-PDU includes a “Type” field, a “Control PDU Type” field, a “Selective NACK SN” field, a “Selective NACK First Octet” field and a “Selective NACK Last Octet” field.
  • a payload portion of the STATUS-PDU may include multiple sets of “Selective NACK SN” fields, “Selective NACK First Octet” fields and “Selective NACK Last Octet” fields.
  • the “Control PDU Type” field is a field showing a type of the RLC-control-PDU.
  • a STATUS-PDU (ACK) or a STATUS-PDU (NACK) or the like is assumed.
  • the “Selective NACK SN” field is a field showing a sequence number of the RLC-data-PDU for which RLC retransmission has been determined to be necessary in a receive window of the RLC sublayer of the receiving-side apparatus.
  • the “Selective NACK First Octet” field is a field showing that from which byte (octet) in the RLC-data-PDU specified by the “Selective NACK SN” field needs to be retransmitted.
  • the “Selective NACK Last Octet” field is a field showing that up to which byte (octet) in the RLC-data-PDU specified by the “Selective NACK SN” field needs to be retransmitted.
  • the retransmission buffer 15 is configured to store an RLC-data-PDU or an RLC-data-Sub-PDU from the ACK waiting buffer 14 therein.
  • the RLC-PDU transmitter unit 16 is configured to transmit, to the MAC sublayer, the RLC-data-PDU transmitted from the segmentation-concatenation processor unit 13 and the RLC-data-PDU stored in the retransmission buffer 15 , in a case where a data transmission event is notified from the MAC sublayer.
  • the RLC-PDU transmitter unit 16 may be configured to generate an RLC-data-PDU-piggybacked-control-PDU, by adding the RLC-control-PDU (STATUS-PDU or the like) stored in the RLC-control-PDU buffer 20 to the RLC-data-PDU to be transmitted, and then to transmit the RLC-data-PDU-piggybacked-control-PDU.
  • RLC-control-PDU STATUS-PDU or the like
  • the RLC-PDU transmitter unit 16 is configured to transmit an RLC-PDU via a logical channel established with the RLC sublayer of the receiving-side apparatus.
  • the re-segmentation processor unit 17 is configured to generate multiple RLC-data-Sub-PDUs by segmenting one RLC-data-PDU or RLC-data-Sub-PDU stored in the retransmission buffer 15 in accordance with the communication state of the radio link, that is, in accordance with the allowable amount of transmission data notified by the MAC layer along with the notification. Specifically, the re-segmentation processor unit 17 is configured to perform re-segmentation processing for the RLC-data-PDU or the RLC-data-Sub-PDU stored in the retransmission buffer 15 .
  • the RLC-PDU transmitter unit 18 is configured to transmit, to the MAC sublayer, the RLC-data-Sub-PDU that has been subjected to the re-segmentation processing by the re-segmentation processor unit 17 , in a case where a data transmission event is notified from the MAC sublayer.
  • the RLC-PDU transmitter unit 18 may be configured to generate an RLC-data-Sub-PDU-piggybacked-control-PDU, by adding the RLC-control-PDU (STATUS-PDU or the like) stored in the RLC-control-PDU buffer 20 to the RLC-data-Sub-PDU to be transmitted, and to transmit the RLC-data-Sub-PDU-piggybacked-control-PDU.
  • RLC-control-PDU STATUS-PDU or the like
  • the RLC-control-PDU generation unit 19 is configured to generate a STATUS-PDU (ACK/NACK) in accordance with a notification from the reordering buffer 32 .
  • the RLC-control-PDU buffer 20 is configured to store the RLC-control-PDU generated by the RLC-control-PDU generation unit 19 .
  • the de-multiplex unit 31 is configured to extract a STATUS-PDU from the RLC-PDU received from the MAC sublayer, and then to forward the STATUS-PDU to the ACK waiting buffer 14 , and also to extract and then to forward an RLC-data-PDU and an RLC-data-Sub-PDU to the reordering buffer 32 .
  • the MAC sublayer is configured to transmit an RLC-PDU to the RLC sublayer without performing reordering processing as described above.
  • the reordering buffer 32 is configured to perform the reordering processing for the stored RLC-data-PDU (or RLC-data-Sub-PDU).
  • the reordering buffer 32 is configured to manage a receive window that defines the upper limit value (“VR (MR)”) and the lower limit value (“VR(R)”) of the sequence number of a receivable packet.
  • the reordering buffer 32 is configured to cause RLC-data-PDUs (in-sequence) stored (in consideration of modulo operation) in the order of the sequence numbers to be stored in the reassembly buffer 33 .
  • the reordering buffer 32 is configured to perform RLC-data-PDU loss detection processing using a reordering timer for an RLC-data-PDU (out-of-sequence) not stored (in consideration of modulo operation) in the order of the sequence numbers.
  • the reordering buffer 32 is configured to notify the RLC-control-PDU generation unit 19 that a loss is detected for an unreceived RLC-data-PDU, in a case where such a loss is detected.
  • the reordering buffer 32 is configured to start the reordering timer, when receiving a second packet before receiving a first packet in a case where the sequence number of the first packet is smaller than the sequence number of the second packet.
  • “in a case where the sequence number of the first packet is smaller than the sequence number of the second packet” refers to a comparison result at the stage before modulo operation.
  • the reordering buffer 32 is configured to start the reordering timer in a case where the RLC-data-PDU (second packet) with a given sequence number # 4 is received before the RLC-data-PDU (first packet) with a given sequence number # 3 is received.
  • the reordering buffer 32 determines that a loss of the RLC-data-PDU has occurred (a loss for an unreceived RLC-data-PDU is detected), and then instructs the RLC-control-PDU buffer 20 to transmit a STATUS-PDU (NACK) (retransmission request) for the RLC-data-PDU (first packet) with the given sequence number # 3 .
  • NACK STATUS-PDU
  • the reordering buffer 32 is configured to start the reordering timer likewise, in a case where the RLC-data-PDU with the given sequence number # 4 (second packet) is received before an RLC-data-PDU with a given sequence number # 2 and an RLC-data-PDU with a given sequence number # 3 (multiple first packets) are received.
  • the reordering buffer 32 determines that a loss of the RLC-data-PDU has occurred (a loss for an unreceived RLC-data-PDU is detected), and then instructs the RLC-control-PDU buffer 20 to transmit a STATUS-PDU (NACK) (retransmission request) for the RLC-data-PDU with the given sequence number # 2 and/or the RLC-data-PDU with the given sequence number # 3 (first packet that has not been received).
  • NACK STATUS-PDU
  • the reordering timer may be configured to be set for each logical channel established between RLC sublayers.
  • the receiving-side apparatus is a mobile station UE
  • RRC Radio Resource Control
  • the reordering buffer 32 is configured to assemble an RLC-data-PDU, in a case where the RLC-data-PDU can be assembled from stored RLC-data-Sub-PDUs.
  • the RLC-SDU reassembly unit 34 is configured to assemble and then to transmit RLC-SDUs to an upper layer in the order of the sequence numbers, in a case where the RLC-SDUs can be assembled from the RLC-data-PDUs stored in the reassembly buffer 33 .
  • step S 101 the RLC sublayer of the receiving-side apparatus determines whether or not an RLC-data-PDU (or RLC-data-Sub-PDU) (for example, the RLC-data-PDU with the sequence number # 4 in FIG. 8 ) not in the order of the sequence numbers (in consideration of modulo operation) is received. Step S 101 is repeated herein until it is determined that the RLC-data-PDU not in the order of the sequence numbers is received.
  • RLC-data-PDU or RLC-data-Sub-PDU
  • the RLC sublayer of the receiving-side apparatus starts the reordering timer in step S 102 .
  • step S 103 the RLC sublayer of the receiving-side apparatus determines whether or not all the missing RLC-data-PDUs (actually, an RLC-data-PDU in a receive window, which is not received at the time when the RLC-data-PDU not in the order of the sequence numbers is received, and which is, for example, the RLC-data-PDU having the sequence number # 3 in FIG. 8 ) are received.
  • step S 104 the RLC sublayer of the receiving-side apparatus determines whether or not the reordering timer expires.
  • step S 105 the RLC sublayer of the receiving-side apparatus generates and transmits a STATUS-PDU (NACK) for the RLC-data-PDU that has not been received yet among the missing RLC-data-PDUs.
  • NACK STATUS-PDU
  • the RLC sublayer in a case where the MAC sublayer does not perform the reordering processing for received RLC-PDUs, the RLC sublayer can appropriately detect an occurrence of a loss of an RLC-data-PDU (or RLC-data-Sub-PDU) by using the reordering timer and then transmit a STATUS-PDU (NACK) for the unreceived RLC-data-PDU.
  • NACK STATUS-PDU
  • the description is given of the mobile communication system in which an RLC sublayer of Acknowledge mode (AM) is used as an example.
  • the present invention is not limited to the mobile communication system of this kind, and is applicable to a mobile communication system in which an RLC sublayer of Unacknowledge mode (UM) is used as in the case of a modification example 1.
  • UM Unacknowledge mode
  • the reordering buffer 32 is configured to start the reordering timer, in a case where the RLC-data-PDU (second packet) with the given sequence number # 4 is received before the RLC-data-PDU (first packet) with the given sequence number # 3 is received.
  • the reordering buffer 32 is configured to determine that a loss of the RLC-data-PDU has occurred (a loss in an unreceived RLC-data-PDU is detected), in a case where the RLC-data-PDU (first packet) with the given sequence number # 3 is not received until the aforementioned reordering timer expires.
  • the reordering buffer 32 is configured to then determine that there is no chance to receive the RLC-data-PDU (first packet) with the given sequence number # 3 , that is, to give up receiving of the RLC-data-PDU (first packet) packet with the given sequence number # 3 .
  • the reordering buffer 32 when giving up the receiving of the RLC-data-PDU (first packet) with the given sequence number # 3 , the reordering buffer 32 performs an operation to advance the receive window by setting the lower limit value of the receive window to be a value larger than the sequence number of the RLC-data-PDU (first packet), the receiving of which has been given up.
  • the already received RLC-data-PDU is stored in a reassembly buffer.
  • the reordering buffer 32 is configured to start the reordering timer likewise, in a case where the RLC-data-PDU (second packet) with the given sequence number # 4 is received before an RLC-data-PDU with a given sequence number # 2 and an RLC-data-PDU packet with a given sequence number # 3 (multiple first packets) are received.
  • the reordering buffer 32 is configured to determine that a loss of the RLC-data-PDU has occurred (a loss for an unreceived RLC-data-PDU is detected), and then to determine that there is no chance to receive the RLC-data-PDU with the given sequence number # 2 and/or the RLC-data-PDU with the given sequence number # 3 (unreceived first packets), in a case where not both of the RLC-data-PDU with the given sequence number # 2 and the RLC-data-PDU with the given sequence number # 3 (first packets) is received until the aforementioned reordering timer expires.
  • the reordering buffer 32 is configured to give up receiving of the RLC-data-PDU with the given sequence number # 2 and/or the RLC-data-PDU packet with the given sequence number # 3 (first packets) in this case.
  • the reordering buffer 32 when giving up the receiving of the RLC-data-PDUs packet with the given sequence numbers # 2 and # 3 (first packets), the reordering buffer 32 performs an operation to advance the receive window by setting the lower limit value of the receive window to be a value larger than the sequence numbers of the RLC-data-PDUs (first packets), the receiving of which have been given up.
  • the already received RLC-data-PDU is stored in a reassembly buffer.
  • steps S 201 to S 204 are the same as those in steps S 101 to S 104 shown in FIG. 9 .
  • step S 205 the RLC sublayer of the receiving-side apparatus determines that there is no chance to receive the RLC-data-PDU that has not been received yet among the missing RLC-data-PDUs and gives up receiving of the RLC-data-PDU (that is, abandons the receiving thereof). Then, the RLC sublayer of the receiving-side apparatus performs an operation in step S 206 .
  • step S 206 the RLC sublayer of the receiving-side apparatus sets the lower limit value of the receive window to be a value larger than the sequence number of the RLC-data-PDU, the receiving of which has been given up.
  • step S 207 the RLC sublayer of the receiving-side apparatus determines the presence or absence of an already received RLC-data-PDU whose sequence number becomes outside the receive window.
  • step S 208 the RLC sublayer of the receiving-side apparatus considers this RLC-data-PDU as a target for reassembling an RLC-SDU.
  • the RLC sublayer of the receiving-side apparatus may be configured to determine which one of Acknowledge mode (AM) and Unacknowledge mode (UM) is set, and then to transmit a STATUS-PDU in accordance with the result of the determination.
  • AM Acknowledge mode
  • UM Unacknowledge mode
  • the RLC sublayer of the receiving-side apparatus determines which one of Acknowledge mode (AM) and Unacknowledge mode (UM) is set.
  • the RLC sublayer of the receiving-side apparatus may be configured to transmit a STATUS-PDU (NACK) (step S 105 in FIG. 9 ), in a case where the RLC sublayer of the receiving-side apparatus determines that Acknowledge mode (AM) is set, and to determine that there is no chance to receive the RLC-data-PDU that has not been received yet among missing RLC-data-PDUs, in a case where the RLC sublayer of the receiving-side apparatus determines that Unacknowledge mode (UM) is set, and to give up (abandon) the receiving of the RLC-data-PDU (step S 205 in FIG. 11 ).
  • NACK STATUS-PDU
  • the packet communication method and the receiving-side apparatus according to the present invention are advantageous because the RLC sublayer can appropriately detects an occurrence of a packet loss in a case where the MAC sublayer does not perform reordering processing for received RLC-PDUs.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
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CN101652949A (zh) 2010-02-17
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